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/ɹɛntˈɡɛniəm/ · noun
A transuranic chemical element (symbol Rg) with atomic number 111..
Use roentgenium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Roentgenium means A transuranic chemical element (symbol Rg) with atomic number 111..
Common synonyms include eka-gold, unununium.
The opposite depends on the specific sense.
Use roentgenium where its definition matches the intended context.
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